Prosecutors on Friday played the tape of a call Michael Johnson made from jail on Monday night of this week.

The call was to a female friend and was barely audible. Johnson can be heard talking about the case and laughing. Prosecutors hope jurors find something in it incriminating. Defense lawyers call it irrelevant.

Also on Friday prosecutors pushed their theory about a body in a storage bin.

A neighbor of Johnson testified that, on the day Barnes disappeared, he saw Johnson working hard to move a blue storage bin out of the northwest Baltimore apartment where Johnson once lived and where Barnes was staying.

"He was sweating a little bit," The neighbor said of Johnson. "I offered to help. He said he was OK."

The storage bin is a key element of the case against Johnson. Prosecutors want jurors to believe Johnson killed Barnes inside the apartment, put her body in the bin, then dumped the bin somewhere along the Susquehanna River.

But no bin that may have been used has been recovered.

The neighbor didn't say what time he saw Johnson moving it, and admits he doesn't know what was in it or where Johnson was taking it.

Prosecutors want to have someone crawl into the bin like the one the neighbor said he saw. They hope to show it's big enough to hold someone of Barnes size. So far, the judge hasn't allowed it.

Prosecutors also have no evidence to put Johnson near the river.

They tried to show Johnson's familiar with Harford Country through an aunt who used to live there, but she lived in Joppatowne -- not near the area of the Conowingo Dam where Barnes' body was found.